Type
Code
Description
Solution
Unit working
statue
Blinking
times
F01
Outdoor ambient
temp. sensor failure
Check whether ambient temperature sensor is open, short-circuit or
value drifts too much. Replace it if necessary.
F02
Outdoor evaporator
coil temp. sensor
failure
Check whether outdoor coil temperature sensor is open, short-circuit
or value drifts too much. Replace it if necessary.
F03
Compressor
discharge temp.
sensor failure
Check whether compressor discharge temperature sensor is open,
short-circuit or value drifts too much. Replace it if necessary.
F04
Outdoor Suction
temp. sensor failure
Check whether outdoor suction temperature sensor is open,
short-circuit or value drifts too much. Replace it if necessary.
F05
Evaporating
pressure sensor
failure
Check whether evaporating temperature sensor is open, short-circuit
or broken. Replace it if necessary.
F06
Condensing
pressure sensor
failure
Check whether condensing temperature sensor is open, short-circuit
or broken. Replace it if necessary.
F07
High/low pressure
switch failure
If pressure switch is in open position when unit is in standby statue,
or 2 minutes after compressor stops, unit gives this failure. Check
whether high or low pressure switch is broken or not well connected.
Protection
17
Compressor stops
18
Compressor stops
19
Compressor stops
20
Compressor stops
21
Compressor stops
22
Compressor stops
23
Compressor stops
P14
Compressor speed
down due to
abnormal low
pressure detected
by condensing
pressure sensor
Compressor stops
If system pressure is too low , it activates this protection. Unit
recovers automatically after 5 minutes when it happened the first
time. If same failure happened 3 times in a certain period of time,
unit stops until repowered. Check whether system has not enough
refrigerant or leakage inside(more likely it is not enough refrigerant
that caused this abnormal evaporating pressure); whether fan motor
and water pump is working OK; whether condenser is blocked;
whether EEV whether EEV works normally; whether water
temperature too low, and whether water inlet&outlet temperature has
too big difference in cooling(should no bigger than 8
℃
).
Failure
14
Compressor speed
down
F09
DC fan failure
(one)
Speed of DC fan or one of the DC fan (for dual fan system) can't
reach the required value or no feedback signal. Please check whether
the PCB or fan motor is broken.
25
F11
System evaporating
pressure too low
If system too low pressure protection detected by evaporating
pressure sensor happened 3 times in a certain period of time, it gives
this failure code and unit can't be restarted until repowered. Check
whether system has not enough refrigerant or leakage inside(more
likely it is not enough refrigerant that caused this abnormal
evaporating pressure); whether fan motor and water pump is working
OK; whether condenser is blocked; whether EEV whether EEV
works normally; whether water temperature too low, and whether
water inlet&outlet temperature has too big difference in cooling
(should no bigger than 8
℃
).
F12
System condensing
pressure too high
If system too high pressure protection detected by condensing
pressure sensor happened 3 times in a certain period of time, it gives
this failure code and unit can't be restarted until repowered. Check
whether water flow rate is not enough (more likely it is not enough
water flow rate that caused system build up too high pressure);
whether fan motor and water pump is working OK; whether
condenser is blocked; whether EEV works normally; whether water
temperature too high, and whether water inlet&outlet temperature has
too big difference (should no bigger than 8
℃
)
27
Compressor stops
28
Compressor stops
Failure
F10
DC fan failure
(two)
Speed of both DC fans (for dual fan system) can't reach the required
value or no feedback signal. Please check whether the PCB or fan
motor is broken.
26
Compressor stops
96
9. Failure Code
Summary of Contents for Thermal Plus 12
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